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PARTS LIST / TECHNICAL GUIDE
[SPECIFICATION]
Item
・3 Hands (Hour, minute and second hand)
・Calendar (Date: Date disk)
Driving system
Additional function
Normal position
Crown
1st click position
position
2nd click position
Vibrations per hour
Daily rate
Loss/
Gain
Standard rate for
measurement
Regulation system
Lift angle of the escapement
Continuous operating time
Number of Jewels
Cal.6R15A / 6R15B
Cal. No.
Automatic winding with manual winding mechanism
・Instant date setting device
・Second hand stop function
Manual winding (clockwise only)
Date setting (counter closkwise only)
Time setting / Second hand stop function
21,600 (6 beats per second)
Between +25/-15 seconds per day
(worn on the wrist at temperature-range between 5℃ and 35℃)
Testing positions
Measurement (daily
rate in seconds:s/d)
ETACHRON system
53°
From fully wound to stoppage: Approximately 50 hours
23 Jewels
6R15A / 6R15B
Movement size
・Diameter
Outside ： φ27.4 mm
Casing ： φ27.0 mm
・Height
： 5.25 mm
Instantaneous rate at T0
(Fully wound condition)
6 o'clock at
Dial upward
the top
±10 s/d
±15 s/d
1/16
Isochronous fault
9 o'clock at
Dial upward
the top
±10 s/d
±15 s/d
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Summary of Contents for Seiko 6R15A
- Page 1 PARTS LIST / TECHNICAL GUIDE Cal.6R15A / 6R15B [SPECIFICATION] Cal. No. 6R15A / 6R15B Item ・3 Hands (Hour, minute and second hand) Movement size ・Diameter Outside ： φ27.4 mm ・Calendar (Date: Date disk) Casing ： φ27.0 mm ・Height ： 5.25 mm ...
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Page 2: Parts List
Cal.6R15A/B FEATURES SEIKO Automatic Mechanical Cal. 6R15B is replacement caliber of Cal. 6R15A. Construction of the B series are the same as A series, but using new parts. Since the size of movement is same as A series, the complete movement can be assembled into the watches which originally have the A series movement;... - Page 3 PARTS LIST Cal.6R15A/B Type of oil Oil quantity mark 1 → 52 Disassembling procedures Figs. AO-3 NORMAL QUANTITY SUFFICIENT QUANTITY → 1 Reassembling procedures Figs. 0016 705 0012 354 Date dial guard screw B Date dial guard screw A 0808 060...
- Page 4 PARTS LIST Cal.6R15A/B Type of oil Oil quantity mark AO-3(Moebius-A) NORMAL QUANTITY SUFFICIENT QUANTITY 0509 *** Oscillating weight *Refer to the page 2 for parts code *Refer to the page 10 for assembling position 0012 354 Automatic train bridge screw...
- Page 5 PARTS LIST Cal.6R15A/B Type of oil Oil quantity mark AO-3 NORMAL QUANTITY SUFFICIENT QUANTITY 0012 100 Barrel and train wheel bridge screw 0511 010 First reduction wheel 0363 156 Sliding crown wheel spring *Refer to the page 10 for assembling...
- Page 6 PARTS LIST Cal.6R15A/B Type of oil Oil quantity mark AO-3 NORMAL QUANTITY SUFFICIENT QUANTITY 0012 354 Center wheel bridge screw 0122 302 Center wheel bridge 0251 300 Escape wheel and pinion 0012 168 0224 *** Yoke spring screw Center wheel and pinion...
- Page 7 Roller jewel Total 23 jewels Remarks The correct parts for the following are determined based on the design of the cases. Refer to "SEIKO Watch Parts Catalogue" to choose corresponding parts. ・ Holding ring for dial ・ Date indicator ・...
- Page 8 PARTS LIST Cal.6R15A/B ● Tools and consumables required for disassembling/reassembling Movement holder ● UNIVERSAL MOVEMENT HOLDER (S-682) Watch oils ● SEIKO Watch grease S-6 and S-4. Watch oil AO-3 (or Moebius A) AO-3 8/16...
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Page 9: Technical Guide
TECHNICAL GUIDE Cal.6R15A/B ● Barrel and train bridge Barrel and train wheel bridge jewel frame Enlarged Back side Enlarged After lublicating, set lower plate for barrel and train wheel bridge & screw Lower plate for barrel and train wheel bridge Lower plate for barrel and train wheel bridge screw After lublicating, set First reduction wheel, Pawl lever &... - Page 10 TECHNICAL GUIDE Cal.6R15A/B ● Sliding crown wheel spring Sliding crown wheel spring Barrel and train wheel bridge ● Oscillating weight Rotate the First reduction wheel manually until its hole aligns with the guide pin for Balance cock (gilt dot) Then, set the Oscillating weight vertically at the stem side, and tighten the oscillating weight screw.
- Page 11 TECHNICAL GUIDE Cal.6R15A/B ● How to remove the winding stem 1) Set the winding stem to normal position. 2) Pull out the winding stem, while pushing "A". Setting lever Winding stem ● Disassembling/Reassembling of the First reduction wheel << Disassembling >>...
- Page 12 TECHNICAL GUIDE Cal.6R15A/B ● How to remove and install the Balance complete with stud How to remove How to install 1. Initial phase 1. Initial phase Move the stud support toward the arrow marked Set a new balance complete with stud to the direction until it touches the balance cock.
- Page 13 TECHNICAL GUIDE Cal.6R15A/B ● How to regulate the isochronous fault by adjusting the position of the balance-spring This caliber has the Etachron system for fine regulation of the isochronous fault. The watch shows a gain trend as amplitude decreases and loses time badly near the end of its useful power reserve.
- Page 14 OPERATION MANUAL Cal.6R15A/B 【6R15 operation manual】 1. How to manually wind the mainspring by turning the crown 1) Slowly turn the crown clockwise (in the 12 o’clock direction) to wind the mainspring. 2) Continue to turn the crown until the mainspring is sufficiently wound. The second hand will start moving.
- Page 15 TECHNICAL GUIDE Cal.6R15A/B ●Water resistance test Check the water resistance according to the designated specification of the watch Marking on the case back Test method Applied pressure Air leak test WATER RESISTANT(WATER RESIST) 3 BAR WATER RESIST 5BAR 5 BAR...
- Page 16 TECHNICAL GUIDE Cal.6R15A/B ● Accuracy test Measure the rate in three different positions within 30 minutes after the watch is fully wound up (wait approximately for 5 minutes after winding up in order to get a stable oscillation of the balance) and make sure the value shows within the range in the table below.